New York-based Japanese artist Shusaku Arakawa designed this small apartment block in 2005 in the Tokyo suburb of Mitaka in conjunction with his poet partner, Madeline Gins. According to the SushiLog: ‘Painted in eye-catching blue, pink, red, yellow and other bright colors, the building resembles the indoor playgrounds that attract toddlers at fast-food restaurants. Inside, each apartment features a dining room with a grainy, surfaced floor that slopes erratically, a sunken kitchen and a study with a concave floor. Electric switches are located in unexpected places on the walls so you have to feel around for the right one. A glass door to the veranda is so small you have to bend to crawl out’.